Impulse-pump.



J. B. OANN.

IMPULSE PUMP.

APPLICATION FILED JUNE 2,1913.

1 ,09'7,53 1. Patented May 19, 1914;

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IMPULSE-PUMP.

answer.

To all whom it may concern:

Be it known that l, Josnrn' BOARDMAN CANN, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Impulse-Pumps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to pneumatic pumps, and as its principal object contemplates the provision of a device of the character set forth which may be readily applied to a cylinder of any four-cycle combustion engine and will quickly and elliciently inflate the tires of an automobile.

A further object of this invention is to provide an air pump, applicable to the cylinder of an internal combustion engine, which will be operated by the impulse given by the compression of incoming gas entering the cylinder from the carbureter, mingled with additional atmospheric air mechanically ad mitted to the cylinder, during the upward stroke of the engine.

A still further object is to construct the pump with such regard to proportion, number and arrangement of parts that it may be cheaply manufactured, and will be durable and efficient in its operation.

The above and additional objects are accomplished by such means as are illustrated in the accompanying drawings, described in the following specification, and then more particularly pointed out in the claims which are appended hereto and form a part of this application.

With reference to the drawings, wherein T have illustrated the preferred embodiment of my invention as it is reduced to practice, and throughout the several views of which similar reference numerals designate corresponding parts: Figure 1 is a longitudinal section of the pump, illustrating the various parts in assembled relation; Fig. 2 is a top plan view; Fig. 3 is a vertical section taken through the air inlet valve; and Fi 4: is a section on the line 47 1- of Fig. 8.

Proceeding now to the description of the drawings, the numeral 1 designates a prefer-- ably cylindrical outer casing, the lower terminal of which is exteriorly screw threaded to receive the internally screw threaded annular flange 2 of a closure cap 3, centrally Specification of Letters Patent.

Application filed June 2, 1913.

Patented May in, 1914.

Serial No. 771,266.

of which is formed an internally screw threaded boss i adapted to receive a nipple to be screw threaded in the engine cylinder. By removing the spark plug of one cylinder of the engine, a nipple may be threaded in the spark plug opening and the member f applied, the pump casing being thus held in desired position on the cylinder. Within the caslng 1 is arranged an inner casing 5 of smaller diameter and length than the member 1. The inner casing 5 is screw threaded externally at its upper end to receive the internally screw threaded annular flange 6 of a closure cap 7, the annular upwardly extending flange 8 of which is screw threaded into the upper end of the member 1 and bears against the closure plate 9 thereof. he member 9 carries a centrally disposed downwardly extending boss 10 cast with a vertically extending valve stem bore 11, and an enlarged bore or recess 12, this latter recess being adapted to receive the upper terminal of a spiral spring 13 mounted in encircling engagement on the valve stem it of a puppet valve 15. The valve 15 is of customary structure and is normally seated in the valve seat formed in the member 7, illustrated in Fig. 1. The inner casing 5 is communicant with the atmosphere through the air inlet pipes 16.

Extending downwardly from the level of the air inlet 16 is a secondary inner casing 17 formed integrally with the member 5 and externally screw threaded to receive the internal annular lug 18 of a band wall 19 which in the assembled relation of the parts 18 and 7, extends in parallel spaced relation to the member 17 and acts as a receiving chamber for one terminal of a spiral spring 20, mounted in encircling engagement with a piston rod 21. The piston rod 21 is equipped at one terminal with a piston head 22 having the customary packing ring 23 and carries at its upper terminal a piston head 24L of less diameter than the member 22 and also equipped with a packing ring 25.

The member 22 is arranged for movement through the lower portion of the outer casing 1 while the member 2% is arranged for sliding movement through the inner casing The spring 20 bears at one terminal against the piston edge 29. and at the other terminal against the member 18, being socured at each terminal by any suitable fastening means. This spring is of the expansion type and is adapted to normally hold the piston head 23, in its lowermost position, in spaced relation to the member 3, as illustrated in Fig. 1.

It is desirable to emphasize the fact that the spring 20 acts to hold the piston head :22 in spaced relation from the member 3, for it is readily apparent that were the piston head 22 to come in contact with the member 3 it would strike the closure cap with great force on each down-stroke of the piston. It is also to be observed in this connection that the spring 20 is of such length and is of such resisting power that when compressed to a maximum limit on the up-stroke of the piston rod 21, it will prevent the engagement of the piston head 24: with the memher 7.

The chamber formed between the member 7 and the member 9 is provided with a coupling plate 26, internally screw threaded and adapted to receive an air hose 27. The chamber formed in the outer casing 1 below the member 7 is eommunicant with the atmosphere through openings 28 formed in the wall of the casing 1 adjacent the upper end thereof.

It has been found after examination that when the gas engine is slowed down to its slowest running point, which will then give very rapid pulsation in a pump of this na ture, there will not be suflicient gas admitted through the throttle to completely fill the cylinder to which the pump is attached. Consequently the compression on the up ward stroke would be much less than it would be with the cylinder completely filled, so there has been added an auxiliary air in let valve illustrated in detail in Fig. 3 and designated as an entirety by the numeral 29. This valve 29 is formed as a part of the cap 3, being preferably arranged, in practice, intermediate the length of the boss 4. In the preferred embodiment illustrated in detail in Fig. 3 the valve casing is formed by two annular, laterally extending flanges 30 and 31, formed integrally with the member 4. The flange 30 is internally screw threaded to receive a closure plug 32 which is cored to produce a recess 33 and is centrally equipped with an annularly disposed ring 34, the ring 34: and recess 33 being provided for the obvious purpose of receiving the terminal of a valve stem 35. A valve head 36, substantially frusto-conical in shape, is carried by the valve stem 35 and is normally held in closed position against a valve seat 37 by a helical spring 38, which is wound around the valve stem and bears at one terminal against the ring 3st and at the other against the inner face of the member 36. The valve seat 37 is formed with a plurality of channels 39, which are four in number, in the preferred embodiment of this invention, as illustrated in detail in Fig. 4. hen as will be hereinafter more fully disclosed the air enters the valve inlet 40, upon the recession of the valve 36 from the valve seat 37, it passes around the valve through the channels 39. It is desirable to emphasize the fact that while the valve above descidbed is preferably employed in connection with the impulse pump of this invention, any other desired and suitable type of puppet'valve may be employed without impair- 'ing the efficiency of the bump.

The actual constructionof the pump befing thus disclosed, it now remains to describe the operation of the pump when ap 'plied to an engine cylinder.

In this connection reference will be made to the lower chamber of the outer casing 1 as chamber A, the chamber formed interiorlv of the mem- 3 ber 5 as chamber B, and the chamber formed between the members 7 and 9 as chamber C.

After the nipple connecting the boss t has been applied to the cylinder, in the manner above described, the engine is started, and

as the best eiiiciency of the pump will be obj tained with the engine running at its lowest point of throttle, sufiicient gas will not be admitted from the carbureter to fill the cylinder to its greatest density on the suc tion stroke, and there will be a partial vacu um within the cylinder which will be filled by atmospheric air forcing open the valve and admitting a sufficient supply of air to completely fill the cylinder of the engine,

. which on the upstroke will compress against 1 the head of the piston 22 carrylng the mem- '15 from its seat, thus forcing the air into the chamber C, which will retain the same pressure as the air in the hose 2?, and the tire to which the hose 2? has been attached. As soon as the member 2st has reached the upper terminal of the chamber 13, at which movment the upstroke of the engine will have been completed, the spring 20 will have been subjected to its maximum degree of compression, preventing the piston head 24: from coming in contact with the member 7, and upon the downstroke of the engine a partial vacuum will be created of less resistance than atmospheric pressure which entering through the passages 28 will quickly force the lower piston 23 downward to its starting point, the extreme downward action being restrained by the spring 20. It will of course be observed that during the upward movement of the piston head 22 the air within the chamber A will exhaust through the openings 28, thus preventing the necessity of forcing the piston head 22 upwardly against air compression.

In reduction to practice, I have found that the form of my invention, illustrated in the drawings and referred to in the above description, as the preferred embodiment, is the most efficient and practical; yet realizin that the conditions concurrent with the adoption of my device will necessarily vary, I desire to emphasize the fact that various minor changes in details of construction, proportion and arrangement of parts may be resorted to when required, without sacrificing any of the advantages of my invention, as defined in the appended claims.

iVhat is claimed is 1. An impulse pump, comprising an outer casing, an inner casing mounted within the outer casing in spaced relation to the side and end walls thereof, means for supporting the inner casing within the outer casing, and admitting atmospheric air thereto, a closure cap for the upper end of said inner casing, an annular downwardly extending llange on said cap engaging the sides of the inner casing, said cap having a valve seat centrally thereof communicating with the interior of the inner casing, an upwardly extending annular flange formed near the edge of said closure cap, engaging the inner side wall of the outer casing and upper end wall thereof and forming a chamber, a valve positioned within the chamber and en gaging the valve seat in the cap, said chamber having a discharge opening therein, pistons operatively arranged Within the inner and enter casings, spring means for returning the pistons to operative position and the lower end of said outer casing provided with an opening therein adapted for communication with an engine cylinder, said outer casing having discharge openings adjacent its upper end.

2. An impulse pump comprising an outer casing, an inner casing positioned within the outer casing in spaced relation to the side and end walls thereof, a closure cap having a central valve opening therein, mounted upon the upper end of said inner casing, a downwardly extending annular flange on the closure cap engaging the sides of the inner casing, an upwardly extending peripheral flange on the cap, engaging the side and top walls of the outer casing and forming a chamber, a valve positioned within the chamber and engaging the valve opening in said cap, said chamber having a disoharge opening in its side walls, means within the outer casing adapted to be operated by exhaust from an engine for forcing air through said inner easing into said chamber comprising pistons slidably mounted within the inner and outer casings, and spring means operatively connected with said pistons, said outer casing having discharge openings therein, and air intake pipes communicating with the inner casing and atmosphere.

In testimony whereof I allix my signature in presence of two witnesses.

JOSEPH BOARDMAN CANN. Witnesses Fn'nnnnion S. Corrrn, M. O. BIGIIAM.

triples of this patent may be obtained for five cents each, by addressing the Gomminioner of Iatmtl. Washington, D. O. 

